/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-dark: #1E3A8A;
            --secondary: #0284C7;
            --accent: #F97316;
            --bg-light: #F8FAFC;
            --text-main: #1E293B;
            --text-muted: #475569;
            --border-color: rgba(226, 232, 240, 0.9);
            --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 30px -4px rgba(30, 64, 175, 0.12);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            color: var(--text-main);
            background-color: #FFFFFF;
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            -webkit-font-smoothing: antialiased;
        }

        .custom-card {
            background-color: #FFFFFF;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
            transition: all 0.25s ease-in-out;
        }

        .custom-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: rgba(30, 64, 175, 0.3);
        }

        .nav-dropdown-menu {
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .group:hover .nav-dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }

        .hero-banner-bg {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 64, 175, 0.8) 100%), url('/assets/images/5bf5b419a69d5ff9.jpg');
            background-size: cover;
            background-position: center;
        }